EP0186493B1 - Silikon-Gummiverbundwerkstoff - Google Patents

Silikon-Gummiverbundwerkstoff Download PDF

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Publication number
EP0186493B1
EP0186493B1 EP85309414A EP85309414A EP0186493B1 EP 0186493 B1 EP0186493 B1 EP 0186493B1 EP 85309414 A EP85309414 A EP 85309414A EP 85309414 A EP85309414 A EP 85309414A EP 0186493 B1 EP0186493 B1 EP 0186493B1
Authority
EP
European Patent Office
Prior art keywords
silicone rubber
composite
silicone
hollow
cellular
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
EP85309414A
Other languages
English (en)
French (fr)
Other versions
EP0186493A2 (de
EP0186493A3 (en
Inventor
Motoyasu Nakanishi
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Suzuki Sogyo Co Ltd
Original Assignee
Suzuki Sogyo Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Suzuki Sogyo Co Ltd filed Critical Suzuki Sogyo Co Ltd
Publication of EP0186493A2 publication Critical patent/EP0186493A2/de
Publication of EP0186493A3 publication Critical patent/EP0186493A3/en
Application granted granted Critical
Publication of EP0186493B1 publication Critical patent/EP0186493B1/de
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
    • C08L83/00—Compositions of macromolecular compounds obtained by reactions forming in the main chain of the macromolecule a linkage containing silicon with or without sulfur, nitrogen, oxygen or carbon only; Compositions of derivatives of such polymers
    • C08L83/04—Polysiloxanes
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
    • C08K7/00—Use of ingredients characterised by shape
    • C08K7/22—Expanded, porous or hollow particles
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
    • C08G77/00—Macromolecular compounds obtained by reactions forming a linkage containing silicon with or without sulfur, nitrogen, oxygen or carbon in the main chain of the macromolecule
    • C08G77/04—Polysiloxanes
    • C08G77/12—Polysiloxanes containing silicon bound to hydrogen
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
    • C08G77/00—Macromolecular compounds obtained by reactions forming a linkage containing silicon with or without sulfur, nitrogen, oxygen or carbon in the main chain of the macromolecule
    • C08G77/04—Polysiloxanes
    • C08G77/20—Polysiloxanes containing silicon bound to unsaturated aliphatic groups
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
    • C08G77/00—Macromolecular compounds obtained by reactions forming a linkage containing silicon with or without sulfur, nitrogen, oxygen or carbon in the main chain of the macromolecule
    • C08G77/42—Block-or graft-polymers containing polysiloxane sequences
    • C08G77/44—Block-or graft-polymers containing polysiloxane sequences containing only polysiloxane sequences
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
    • C08G77/00—Macromolecular compounds obtained by reactions forming a linkage containing silicon with or without sulfur, nitrogen, oxygen or carbon in the main chain of the macromolecule
    • C08G77/70—Siloxanes defined by use of the MDTQ nomenclature

Definitions

  • This invention relates to the use of a composite silicone rubber material as a shock absorbing material.
  • this kind of silicone material has a pressure conductivity similar to a liquid, it disperses and distributes quickly and uniformly a locally applied external pressure such as a shock to the surrounding area and absorbs the pressure by non-resilient deformation. The material thus reduces repercussive effects.
  • Toray Silicone CY52 (brand name), which is manufactured by Toray Silicone Kabushiki Kaisha is an example of this kind of silicone material.
  • This silicone rubber material has excellent shock absorption properties but it is not very suitable for use in sports goods such as protectors for use on the human body as its specific gravity is high and it is expensive.
  • the present invention thus provides the use, as a shock absorbing material, of a composite silicone rubber material comprising a silicone rubber (having a penetration of 50 to 200 as measured in accordance with JIS K2530, 1976, using a 50g load) having cellular or hollow particulate resilient synthetic resin material included therein.
  • the cellular or hollow material may be in the form of hollow particles (such as "microspheres") or synthetic foam and generally has a particle size of 5-300 m ⁇ 10 ⁇ 6.
  • the particles are preferably uniformly distributed throughout the composite material. This material reduces the specific gravity and cost of the composite material.
  • the hollow or cellular material may be an organic synthetic resin-based cellular material such as Expancel (brand name, sold by Nippon Fillite Co., Ltd), for example in an amount of 1 to 4 weight %.
  • Expancel brand name, sold by Nippon Fillite Co., Ltd
  • the silicone rubber used may for example be a liquid two-part room temperature-vulcanisable or polyaddition-type silicone, such as Toray Silicone CY52.
  • the composite material may for example be produced by mixing the silicone-forming ingredients and the hollow or cellular material and hardening the mixture, preferably by heating.
  • the penetration herein shown is measured in accordance with JIS K 2530-1976 - (50g load). This standard relates to the petroleum asphalt penetration testing method wherein samples with penetration of 350 or less are tested with a load of 100g and rubber materials are tested with a load of 50g.
  • the price percentages are obtained by relating the price of the material containing both the silicone and Expancel to the price of the silicone material itself.
  • the silicone material used in the above examples is made up by mixing the component liquids of Toray Silicone CY52, adding hollow or cellular material to the mixture and heating the mixture.
  • resilient hollow cells are capable of increasing the shock absorbing effect and improving the recoverability of the composite material since they can add a resisting force (on account of elastic deformation) to the shock absorbing effect deriving from the non-elastic deformation of the silicone material.
  • the composite material of the invention contains number of fine hollow or cellular particles 2 in a silicone rubber 1, in much the same way as if the composition contained a number of bubbles.
  • the composite material of the invention can provide remarkable shock absorption as compared to Ensolite (brand name for a foamed polyethylene-based shock absorbing material manufactured by Uniroyal Corporation in the United States), and silicone rubber material only, as shown with the results of the dropping steel ball shock test in Table 2 below.
  • Ensolite brand name for a foamed polyethylene-based shock absorbing material manufactured by Uniroyal Corporation in the United States
  • silicone rubber material only
  • the silicone rubber material (sample No.2) has a penetration of 150.
  • the composite material No.1 in (sample No.3) according to the invention is made by mixing the components for a silicone rubber having a penetration of 150 with 1.4 weight % Expancel DE.
  • Composite No.2 (sample No.4) according to the invention is made by mixing the components for a silicone rubber having a penetration of 150 with 3.0% Expancel DE.

Landscapes

  • Chemical & Material Sciences (AREA)
  • Health & Medical Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Medicinal Chemistry (AREA)
  • Polymers & Plastics (AREA)
  • Organic Chemistry (AREA)
  • Compositions Of Macromolecular Compounds (AREA)
  • Manufacture Of Porous Articles, And Recovery And Treatment Of Waste Products (AREA)
  • Building Environments (AREA)
  • Vibration Prevention Devices (AREA)

Claims (4)

  1. Verwendung eines Silikonkautschukverbundmaterials als Stoßdämpferwerkstoff, bestehend aus einem Silikonkautschuk (mit einer Eindringtiefe von 50 bis 200 wie gemäß JIS K2530, 1976, mit 50 g Belastung gemessen) mit darin zur Erhöhung der stoßdämpfenden Wirkung eingebautem zellenförmigen oder hohlen teilchenförmigen elastischen Kunstharzmaterial.
  2. Verwendung nach Anspruch 1, wobei das zellenförmige oder hohle Material eine Teilchengröße von 5-300 m·10⁻⁶ aufweist.
  3. Verwendung nach Anspruch 1 oder 2, wobei das Verbundmaterial 1-4 Gew.-% Kunstharzschaumteilchen enthält.
  4. Verwendung nach einem der vorhergehenden Ansprüche, wobei das Verbundmaterial in Folienform vorliegt.
EP85309414A 1984-12-28 1985-12-23 Silikon-Gummiverbundwerkstoff Expired - Lifetime EP0186493B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP277787/84 1984-12-28
JP27778784 1984-12-28

Publications (3)

Publication Number Publication Date
EP0186493A2 EP0186493A2 (de) 1986-07-02
EP0186493A3 EP0186493A3 (en) 1988-05-11
EP0186493B1 true EP0186493B1 (de) 1993-03-31

Family

ID=17588287

Family Applications (1)

Application Number Title Priority Date Filing Date
EP85309414A Expired - Lifetime EP0186493B1 (de) 1984-12-28 1985-12-23 Silikon-Gummiverbundwerkstoff

Country Status (6)

Country Link
US (1) US4861804A (de)
EP (1) EP0186493B1 (de)
JP (1) JPH0625304B2 (de)
KR (1) KR930004059B1 (de)
CA (1) CA1285683C (de)
DE (1) DE3587233T2 (de)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102015010380A1 (de) 2015-08-07 2017-02-09 Universität Kassel Flüssig- oder Feststoffsilikon in unvulkanisiertem Zustand sowie Verfahren zur Verarbeitung von Flüssig- und Feststoffsilikon im Spritzgussverfahren
EP4596208A1 (de) 2024-01-31 2025-08-06 Universität Kassel (Körperschaft d. öffentlichen Rechts) Verfahren zur herstellung eines verbundbauteils mit einem thermoplastkörper und mit einem geschäumten silikonkörper

Families Citing this family (38)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6483946A (en) * 1987-09-26 1989-03-29 Cubic Eng Kk Inertia damper
JPS6483947A (en) * 1987-09-26 1989-03-29 Cubic Eng Kk Inertia damper
JPH0198730A (ja) * 1987-10-09 1989-04-17 Kiyuubitsuku Eng:Kk 慣性ダンバー
US4997804A (en) * 1988-05-26 1991-03-05 The United States Of America As Represented By The United States Department Of Energy Low density, resorcinol-formaldehyde aerogels
JP2668422B2 (ja) * 1988-11-15 1997-10-27 株式会社サクラクレパス 中芯式筆記具用水性顔料インキ組成物
US5229216A (en) * 1989-01-23 1993-07-20 Nihon Tokushu Toryo Co., Ltd. Vibration-damping sheet
JP2841088B2 (ja) * 1989-11-07 1998-12-24 株式会社シーゲル シリコーンゲル製緩衝防振材とその製造方法
JPH0791423B2 (ja) * 1990-03-30 1995-10-04 信越化学工業株式会社 防振性ゴム
FR2665706B1 (fr) * 1990-08-10 1994-03-18 Commissariat A Energie Atomique Materiau compressible, injectable en couche mince pour joint de calage et son procede de fabrication.
JP3274487B2 (ja) * 1992-01-30 2002-04-15 東レ・ダウコーニング・シリコーン株式会社 発泡性シリコーンゴム組成物およびシリコーンゴム発泡体の製造方法
US5362543A (en) * 1993-02-23 1994-11-08 Jay Medical, Ltd. Pressure-compensating compositions and pads made therefrom
JPH0726145A (ja) * 1993-07-06 1995-01-27 Toray Dow Corning Silicone Co Ltd シリコーンコンパウンドおよびその製造方法
US5833320A (en) * 1994-11-25 1998-11-10 Yamaha Hatsudoki Kabushiki Kaisha Vehicle seat and shock-absorbing material
DE19540886A1 (de) * 1995-11-02 1997-05-07 Wacker Chemie Gmbh Kompressibler Siliconkautschuk
JP3483073B2 (ja) * 1995-11-02 2004-01-06 ヤマハ発動機株式会社 小型船舶
US5869164A (en) * 1995-11-08 1999-02-09 Rik Medical Llc Pressure-compensating compositions and pads made therefrom
US5895805A (en) * 1996-09-03 1999-04-20 Marine Manufacturing Industries Inc. Composition of poly(dimethylsiloxane) and microspheres
JP3558527B2 (ja) * 1998-07-06 2004-08-25 信越化学工業株式会社 シリコーンゲルシート、組成物およびその製法
GB9815080D0 (en) * 1998-07-10 1998-09-09 Dow Corning Sa Compressible silicone composition
US6254105B1 (en) * 1999-04-02 2001-07-03 Elo Touchsystems, Inc. Sealing system for acoustic wave touchscreens
US6235801B1 (en) * 1999-04-02 2001-05-22 Miguel A. Morales Method of expanding a gel material
JP2000303022A (ja) * 1999-04-21 2000-10-31 Dow Corning Toray Silicone Co Ltd エアーバッグ用シリコーンゴム系コーティング剤組成物
JP3804753B2 (ja) * 2000-06-29 2006-08-02 信越化学工業株式会社 中空フィラー含有シリコーンゴム及びその製造方法
US6967221B2 (en) 2000-06-29 2005-11-22 Shin-Etsu Chemical Co., Ltd. Hollow filler-containing silicone rubber and method of production
JP4114050B2 (ja) * 2002-10-15 2008-07-09 信越化学工業株式会社 電子機器用シリコーン断熱シート及びこれを用いた断熱方法
US8124661B2 (en) * 2003-06-20 2012-02-28 Northrop Grumman Guidance And Electronics Company, Inc. Introducing voids into polymeric material for buffering one or more stress sensitive components from one or more stresses
US20050003216A1 (en) * 2003-06-30 2005-01-06 Jean-Marc Frances Microparticle containing silicone release coatings having improved anti-block and release properties
CN100422264C (zh) * 2004-05-07 2008-10-01 信越化学工业株式会社 硅氧烷凝胶组合物
ES2412379T3 (es) 2005-04-25 2013-07-11 G&G Biotechnology Ltd. Dispositivo protésico implantable ligero.
US8431647B2 (en) * 2006-12-27 2013-04-30 Bluestar Silicones France Sas Adhesive silicone compositions and adhesive bonding/seaming therewith
CA2681528C (en) * 2007-03-21 2018-10-23 Ashtech Industries, Llc Utility materials incorporating a microparticle matrix
CA2786279C (en) * 2010-01-18 2018-02-20 G & G Biotechnology Ltd Lightweight breast implant material
US8781275B2 (en) 2010-07-27 2014-07-15 Boston Scientific Scimed, Inc. Laser assembly with shock absorber
JP2016083076A (ja) * 2014-10-24 2016-05-19 株式会社イノアックコーポレーション 衝撃吸収材
EP3267942B1 (de) 2015-03-12 2022-05-04 G&G Biotechnology Ltd. Implantatmaterial aus verbundstoff
IL276645B2 (en) 2018-02-18 2025-01-01 G & G Biotechnology Ltd Implants with shell with improved adhesion
JP2020195246A (ja) * 2019-05-30 2020-12-03 日本電産サンキョー株式会社 ダンパー部材の製造方法
JP7548751B2 (ja) * 2020-08-11 2024-09-10 ニデックインスツルメンツ株式会社 アクチュエータ及びその製造方法

Family Cites Families (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3317455A (en) * 1963-01-21 1967-05-02 Mcdonnell Aircraft Corp Thermal insulation and ablation material
US3293663A (en) * 1963-08-12 1966-12-27 Dow Corning Surgically implantable human breast prosthesis
GB1373055A (en) * 1971-07-06 1974-11-06 Gen Electric Organosiloxane gel
JPS5217540B2 (de) * 1973-10-04 1977-05-16
JPS511552A (de) * 1974-06-27 1976-01-08 Toyoda Gosei Kk
US3986213A (en) * 1975-05-27 1976-10-19 Medical Engineering Corporation Gel filled medical devices
GB1556612A (en) * 1976-06-11 1979-11-28 Metzger A C Sound attenuating compositions
DE3100746A1 (de) * 1981-01-13 1982-07-22 Andreas 3170 Gifhorn Dietz "dichtungsmasse, vorzugsweise fugenabdichtungsmasse, sowie ein verfahren zur herstellung und zur verarbeitung"
AT378966B (de) * 1981-03-19 1985-10-25 Secans Ag Masse, die zur herstellung oder unterfùtterung von zahnprothesen geeignet ist, sowie verfahren zur herstellung der masse
DE3129888C2 (de) * 1981-07-29 1985-01-03 Secans AG, Zug Verfahren zur Herstellung einer Masse für die Abstützung von Teilen des menschlichen Körpers
US4433069A (en) * 1983-01-03 1984-02-21 Dow Corning Corporation Method for preparing flame resistant polysiloxane foams and foams prepared thereby

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
Patent Abstracts of Japan, unexamined applications, C.Field, vol.7, no.143,June 22, 1983. The Patent Office Japanense Governement, page 153 C 172* Kokai-no.58-57 462(Nippon Oil Seal Kogyo K.K)*. *

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102015010380A1 (de) 2015-08-07 2017-02-09 Universität Kassel Flüssig- oder Feststoffsilikon in unvulkanisiertem Zustand sowie Verfahren zur Verarbeitung von Flüssig- und Feststoffsilikon im Spritzgussverfahren
WO2017025083A1 (de) 2015-08-07 2017-02-16 Universität Kassel Flüssig- oder feststoffsilikon in unvulkanisiertem zustand sowie verfahren zur verarbeitung von flüssig- oder feststoffsilikon im spritzgussverfahren
DE102015010380B4 (de) 2015-08-07 2020-05-20 Universität Kassel Verwendung von Flüssig- oder Feststoffsilikon als Material zur Verarbeitung im Spritzgussverfahren
EP4596208A1 (de) 2024-01-31 2025-08-06 Universität Kassel (Körperschaft d. öffentlichen Rechts) Verfahren zur herstellung eines verbundbauteils mit einem thermoplastkörper und mit einem geschäumten silikonkörper

Also Published As

Publication number Publication date
KR930004059B1 (ko) 1993-05-19
JPH0625304B2 (ja) 1994-04-06
CA1285683C (en) 1991-07-02
US4861804A (en) 1989-08-29
EP0186493A2 (de) 1986-07-02
JPS61268756A (ja) 1986-11-28
EP0186493A3 (en) 1988-05-11
DE3587233T2 (de) 1993-10-28
DE3587233D1 (de) 1993-05-06
KR860004951A (ko) 1986-07-16

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